I also have had a very bad experience with Armour's pipes. I bought two sets at the same time, complete with silencers, and found that the stub pipe on the long pipe was the same diameter as the pipes themelves so that the short rear pipes would not fit into the stub on the long pipe. They had done the same with the pipes on the front of the silencers. They admitted the fault (they could hardly do otherwise) and found that all the Vin pipes on the shelf were the same. I waited for them to make a new batch and then took the originals back and came home with two more sets in which the sockets were of the correct diameter. They looked alright until I tried to fit them when I found that the rear pipes were much too short and would not reach the stub on the long pipe. Once more a phone call and a trip down to them at which stage, in order to try to help us all, I offered to bring down an engine/gearbox unit so that they could make a jig to ensure that future sets fit. I got a rude reply that they already had a local Vincent owner and did not need help. The third set of pipes fitted but the stubs on the long pipes to take the rear short pipes are too far forwards and they are obviously different from original. However, by far the worst was that when checking them out before fitting I found that both sets had the holes in the long pipes where the short stub is welded on only about 3/4" diameter. Had I fitted them without checking the bike would have been one of those slow ones due to a severly restricted exhaust flow on the rear cylinder. It took several hours with a solid carbide burr to open out the holes to the correct diameter. If any of you have seen a moder computer controlled tube bending machine in action then you will realise that with the correct equipment there is no problem making very intricate shapes repeatedly accurate to within thous. Somehow we need to get a batch of these made. At the same time on a different thread we also need mudgueards that fit and this should be easy for people with the correct equipment. If it is too expensive for any one parts supplier to fund this then perhaps the VOC should put some of its funds into sourcing and getting made parts which fit. The money would almost certainly be better spent than with Stocks and Shares although just now is not a good time to sell those.
With regards to manufacturing tolerances being the reason that some pipes do not fit, (a word this forum will not accept). Try slackening the cylinder head nuts on an assembled engine with no pipes on. Make every thing really loose and then try to move the heads. Each one is constrained by the tops of the cylinder liner and four studs which hold everything together. We are talking total movement here of tens of thous, not more.